A timing based side channel exists in the OpenSSL RSA Decryption implementation
which could be sufficient to recover a plaintext across a network in a
Bleichenbacher style attack. To achieve a successful decryption an attacker
would have to be able to send a very large number of trial messages for
decryption. The vulnerability affects all RSA padding modes: PKCS#1 v1.5,
RSA-OEAP and RSASVE.
For example, in a TLS connection, RSA is commonly used by a client to send an
encrypted pre-master secret to the server. An attacker that had observed a
genuine connection between a client and a server could use this flaw to send
trial messages to the server and record the time taken to process them. After a
sufficiently large number of messages the attacker could recover the pre-master
secret used for the original connection and thus be able to decrypt the
application data sent over that connection.
References
| Link | Resource |
|---|---|
| https://security.gentoo.org/glsa/202402-08 | |
| https://www.openssl.org/news/secadv/20230207.txt | Vendor Advisory |
| https://security.gentoo.org/glsa/202402-08 | |
| https://www.openssl.org/news/secadv/20230207.txt | Vendor Advisory |
Configurations
Configuration 1 (hide)
|
Configuration 2 (hide)
|
History
13 Feb 2025, 17:15
| Type | Values Removed | Values Added |
|---|---|---|
| Summary | (en) A timing based side channel exists in the OpenSSL RSA Decryption implementation which could be sufficient to recover a plaintext across a network in a Bleichenbacher style attack. To achieve a successful decryption an attacker would have to be able to send a very large number of trial messages for decryption. The vulnerability affects all RSA padding modes: PKCS#1 v1.5, RSA-OEAP and RSASVE. For example, in a TLS connection, RSA is commonly used by a client to send an encrypted pre-master secret to the server. An attacker that had observed a genuine connection between a client and a server could use this flaw to send trial messages to the server and record the time taken to process them. After a sufficiently large number of messages the attacker could recover the pre-master secret used for the original connection and thus be able to decrypt the application data sent over that connection. |
Information
Published : 2023-02-08 20:15
Updated : 2025-03-20 21:15
NVD link : CVE-2022-4304
Mitre link : CVE-2022-4304
CVE.ORG link : CVE-2022-4304
JSON object : View
Products Affected
stormshield
- stormshield_network_security
- endpoint_security
- sslvpn
openssl
- openssl
CWE
CWE-203
Observable Discrepancy